RF adapter for field device with low voltage intrinsic safety clamping
First Claim
1. An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process, the adapter comprising:
- a first adapter connection configured to couple to a first wire of a two wire process control loop;
a second adapter connection configured to couple to a first transmitter connection of a process control transmitter;
a third adapter connection configured to couple to a second transmitter connection of the process control transmitter and to a second wire of the process control loop, wherein the third adapter connection is used to communicate information on the two wire process control loop;
wireless communication circuitry configured to provide wireless communication for the process control transmitter, wherein the first and second adapter connections are used to power the wireless communication circuitry; and
intrinsic safety circuitry coupled to at least one of the first, second and third adapter connections configured to limit energy transfer to a value which is less than an intrinsic safety value, wherein the two wire loop is used for powering the process control transmitter and powering the wireless communication circuitry, and the two wire process control loop is further configured to ca information communicated from the third adapter connection.
1 Assignment
0 Petitions
Accused Products
Abstract
An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process includes a first connection configured to couple to a first side of a two wire process control loop, a second connection configured to couple to a second side of the two wire process control loop and in series with a first connection to a process control transmitter, and a third connection configured to couple to a second connection of the process control transmitter. Wireless communication circuitry is coupled to at least the third connection and is configured to provide wireless communication for the process control transmitter. Intrinsic safety circuitry coupled to at least one of the first, second and third connections is configured to limit transfer of electrical energy to a value which is less than an intrinsic safety value.
408 Citations
25 Claims
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1. An adapter for coupling to a process control transmitter of the type used to monitor a process variable in an industrial process, the adapter comprising:
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a first adapter connection configured to couple to a first wire of a two wire process control loop; a second adapter connection configured to couple to a first transmitter connection of a process control transmitter; a third adapter connection configured to couple to a second transmitter connection of the process control transmitter and to a second wire of the process control loop, wherein the third adapter connection is used to communicate information on the two wire process control loop; wireless communication circuitry configured to provide wireless communication for the process control transmitter, wherein the first and second adapter connections are used to power the wireless communication circuitry; and intrinsic safety circuitry coupled to at least one of the first, second and third adapter connections configured to limit energy transfer to a value which is less than an intrinsic safety value, wherein the two wire loop is used for powering the process control transmitter and powering the wireless communication circuitry, and the two wire process control loop is further configured to ca information communicated from the third adapter connection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of coupling a wireless adapter to a process control transmitter of the type used to monitor a process variable in an industrial process, the method comprising:
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coupling a first adapter connection to a first wire of a two wire process control loop; coupling a second adapter connection to a first transmitter connection of a process control transmitter; coupling a third adapter connection to a second transmitter connection of the process control transmitter; powering wireless communication circuitry with power received from the two wire process control loop through the first and second adapter connections; communicating information on the two wire process control loop using the third adapter connection; and limiting energy transfer through at least one of the first, second and third adaptive connections to a value which is less than an intrinsic safety value, wherein the two wire loop is used for powering the process control transmitter and powering the wireless communication circuitry, and the two wire process control loop is further configured to carry information communicated from the third adapter connection. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification